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SN65LVP20: SN65LVP20 to TLK1521 connection

Ohad Bonneh
Intellectual 2650 points

Part Number: SN65LVP20

We need to connect to old obsolete TLK1521 Serdes input , because TLK1521 is obsolete we are using a SN65LVP20 Serdes LVPECL output instead.

Can you help us understand what are the recommendation for such connection  :

  1. What is the recommended termination on the SN65LVP20 side ? we understand that we need to put pull down to GND on TXP & TXN , is it correct ? if yes what shell be the pull down value ?
  2. I understand that there is internal termination in the TLK1521  :

Do we need to add additional termination on the receiver side ?

  1. The TLK1521 is 2.5V supply operation , What shell be the supply voltage for the SN65LVP20 : 2.5V or 3.3V ?
  2. Do you have a IBIS model for SN65LVP20 for 2.5V operating , the current IBIS model in the website is for 3.3V ?
  3. Shell we put series capacitor on the P & N  signal between the 2 ICs ? if yes 100nF value o.k. ?
  4. Please add any other info if I missed something .

 

  • 0
    TI__Prodigy 100 points

    Hi, Ohad.

    Could you clarify the use case for replacing the devices? I'm not entirely sure how you would replace the TLK1521 SerDes device with SN65LVP20 since TLK1521 is a SerDes and SN65LVP20 is a buffer.

    Best, 

    Ethan